January 2023

The Test for starch

By |2022-09-15T12:41:57+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

  • During the process of photosynthesis, a plant absorbs, a process which is aided by the presence of chlorophyll in the leaf
  • This enables the plant to convert carbon dioxide and water into glucose
  • Some of this glucose is used up by the plant however
  • Any excess is turned into starch for storage
  • You can, therefore, test a plant’s leaf for starch in […]
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Investigating the movement of water within plants

By |2022-09-15T12:41:41+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

A celery plant in dye. Image credit wordpress.com A celery plant in dye. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Investigating the movement of water within plants

Aim: To demonstrate that moves up plants which have a transportation system.

Materials: Young plants with roots/celery plants, water, hand lenses, razor blade/scalpel, food colouring/dye.

Method

  1. Place […]
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Experiment: Comparing the air content of soils

By |2022-09-15T12:40:28+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Sand, Loam and Clay soil samples. Image credit ayersbasementsystems.com Sand, Loam and Clay soil samples. Image credit ayersbasementsystems.com ZIMSEC O Level Combined Science Notes: Comparing the air content of soils  

Materials: small tin cans, measuring cylinders, water, samples of clay, sandy and loam soils, hammer, nail

Method

  • Fill an empty tin can with […]
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Stress in beams

By |2022-09-15T12:39:52+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

Types of stresses that affect beams. The arrows show the direction of force. Types of stresses that affect beams. The arrows show the direction of force. ZIMSEC O Level Combined Science Notes: Stress in beams

  • If a material (beam) is subjected to a force, an equal force acts in the opposite direction
  • This […]
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The reactions of metals and water

By |2022-09-15T12:39:40+02:00January 24th, 2023|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: The reactions of metals and water

  • Water is a compound of oxygen and hydrogen
  • When metals react with water they remove the oxygen from the water
  • We say the metals displace the hydrogen from the water
  • A metal oxide is formed
  • Freeing up the oxygen
  • The following word equation summarizes the nature of […]
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